The cap works great keeping the sweat off my face. The cap material is made with mesh that breathes better than cotton. The brim also acts to shade the sun and helps deters moisture from my sunglasses. In summary, great cap!
This has has a fabric panel in the front and mesh everywhere else so vents well. Because of the solid front, I don't use this hat on hot days, warm days yes it is my go to hat. Although a one size fits all, not as big as the Castelli all mesh version and fits my small brain better. Very comfortable to wear and collects sweat well. I don't wear hats as a fashion statement, but instead to keep the setting sun out of my eyes.
Excellent summer cap, incredible wicking and cooling ability and even helps a bit during rain. Not sure how it will fare in winter with wind protection, but it's not really designed for that use case. Very comfortable and stretchy. Would recommend.